Balanced Coherence Times of Atomic Qubits of Different Species in a Dual 3 x 3 Magic-Intensity Optical Dipole Trap Array
Balanced Coherence Times of Atomic Qubits of Different Species in a Dual 3 x 3 Magic-Intensity Optical Dipole Trap Array
复制标题
双 3 x 3 魔强度光偶极子陷阱阵列中不同物种原子量子位的平衡相干时间
DOI：
10.1103/physrevlett.124.153201
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发表时间：
2020
影响因子：
8.6
通讯作者：
Zhan Mingsheng
中科院分区：
文献类型：
--
作者：
Guo Ruijun;He Xiaodong;Sheng Cheng;Yang Jiaheng;Xu Peng;Wang Kunpeng;Zhong Jiaqi;Liu Min;Wang Jin;Zhan Mingsheng
我们构建了一个极化介导的magic-intensity (MI) optical dipole trap （ODT）阵列，该阵列有效地减轻了光移对混合量子比特的不利影响，从而使混合量子比特的相干时间第一次得到了显著增强和平衡。这种混合物质的神奇捕获技术依赖于三阶交叉项系数的可调性和基态超极化性，而这两种特性本质上依赖于捕获激光的圆偏振度。在实验中，将ODT阵列的量子位的极化精确地调整到一个确定的值，使其魔术捕获所需的工作磁场与魔术捕获另一个具有全圆极化的ODT阵列中的量子位所需的磁场相等。最终，在这种极化介导的MI-ODT阵列中，两个量子位的相干时间分别提高到和。此外，我们还揭示了椭圆偏振的噪声会对量子比特产生消相效应，但可以通过选择有源偏振器件的动态范围来有效地减轻它。我们还表明，由于基态超极化率的降低，量子比特在椭圆偏振MI-ODT中看到的光移可以更有效地补偿。预计这种新型混合粒子MI-ODT阵列将成为构建具有中性原子的可扩展量子计算机的通用平台。
We construct a polarization-mediated magic-intensity (MI) optical dipole trap (ODT) array, in which the detrimental effects of light shifts on the mixed-species qubits are efficiently mitigated so that the coherence times of the mixed-species qubits are both substantially enhanced and balanced for the first time. This mixed-species magic trapping technique relies on the tunability of the coefficient of the third-order cross term and ground state hyperpolarizability, which are inherently dependent on the degree of circular polarization of the trapping laser. Experimentally, polarization of the ODT array forqubits is finely adjusted to a definite value so that its working magnetic field required for magic trapping amounts to the one required for magically trappingqubits in another ODT array with fully circular polarization. Ultimately, in such a polarization-mediated MI-ODT array, the coherence times ofandqubits are, respectively, enhanced up toand. Moreover, we reveal that the noise of the elliptic polarization causes dephasing effect on thequbits but it could be efficiently mitigated by choosing the dynamical range of active polarization device. We also show that light shifts seen by qubits in an elliptically polarized MI-ODT can be more efficiently compensated due to the decrease in the ground state hyperpolarizability. It is anticipated that the novel mixed-species MI-ODT array is a versatile platform for building scalable quantum computers with neutral atoms.